William e



(No Model.)

W. E. SPARKS.

PIN LOGK.

Patented Feb. 22, 1898.

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WITNESSES.-

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NITIED rains n'rnnrr rrrnni IVILLIAM E. SPARKS, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO THE SARGENT d; COMPANY, OF SAME PLACE.

PIN-LOCK.

SPECIFICATION forming part of Letters Patent No. 599,367, dated February 22, 1898. Application filed May 1, 1897. Serial No. 634,723. (No model.)

To aZZ whom it may concern.-

Be it known that 1, WILLIAM E. SPARKS, of the city and county of New Haven, and State of Connecticut, have invented a new and useful Improvement in Screen-Door Locks, fully set forth and described in the following specification, taken in connection with the drawings, which form a part thereof, and in which Figure 1 is a side elevation of a lock embodying my invention, the side of the casing being removed; Fig. 2, an end elevation of the lock; Figs. 3 and 4, front and rear of the tumbler mechanism; Fig. 5, a detail side elevation of the tumbler mechanism; and Fig. 6, an enlarged vertical section of the same on lines 5 5 of Fig. 3 with the key inserted.

In all figures similar letters of reference represent like parts.

My invention relates to an improvement in pin-tumbler locks to be used in combination with a spring mortise-lock, my object being to make a lock simple, durable, and effective for use in screen and similar doors and one in which a flat key may be used.

In the drawings, A represents a cylindrical plate having formed integral therewith a cylindrical longitudinal chamber B, with a vertical extension I) and laterally extending flanges h and b said flanges having screwholes 19 and N. A rotatable cylinder 0 is adapted to fit within the chamber B, and has formed integral therewith and extending beyond the inner face of said chamber 13 an extension C, substantially rectangular in crosssection, the cylinder C and extension 0 being provided with a key-slot G, into which the key is adapted to extend. In the upper edge of the cylinder 0 are radial pockets 0 and 0 having therein tumblers c and 0 In the extension Z) of the chamber B are sockets b and b, in which spiral springs b and b are adapted to fit. Oblong bolts b and Z9 are adapted to fit loosely in the sockets b and h", and the springs 19 and b are adapted to bear on their upper faces, Fig. 6. The sockets b and b correspond to the pockets 0' and 0 when the cylinder 0 is in its normal position, and when the key is removed the springs 21 and I) tend to force the bolts b and Z1 downward into the pockets 0 and 0 thus keeping the cylinder locked against rotation, as more fully described hereinafter. A cap F is adapted to fit over and be secured to the inner end of the cylinder 0, having a slot 0 through which the extension 0 passes.

Secured in any well-known manner in the inside of a case G, containing the mechanism of the spring 1nortise-lock, is a rotatable cylinder I-I, having a bit 7t adapted to engage with a latch-bolt shank h to force the same inwardly against the tension of spring 72 and thus withdraw the latch or bolt upon the partial revolution of the cylinder H. A slot h in the cylinder II corresponds to and is adapted to receive the extension 0. Perforations g and g are made in the case G for the passage of screws or bolts g which are adapted to extend through the door-frame to which the lock is attached, the case G, and screwholes 19 and b in the flanges b and b of the chamber B to hold these parts together. Provision is also made for retracting the latch bolt by means of the hubs K of the knob spindle engaging with flanges 7t on the latchbolt shank 7i in well-known manner.

In operation the spring mortise-lock is set into the door-frame, and the plate having the chamber 13, (be, set into a perforation in said frame until the extension 0 fits through the slot h of the cylinder H. The insertion of the key in the slot 0 forces the tumblers c and c upward against the bolts 71 and h which are thereby forced upward against the tension of the springs b and 12 until their lower faces are flush with the lower faces of the sockets b and 6 when the cylinder 0 and extension 0 may be revolved. The revolving of the cylinder 0 and extension 0 causes the cylinder H to revolve, thus forcing the bit It to engage the latch-bolt shank 71- and retract the latclrbolt, which is returned to its normal position by spring 7L5.

By this construction a spring mortise-lock of simple form is adapted to be operated by an independent or separate tumbler-cylinder mechanism of simple construction, and when the key projects into the extension of the cylinder the extension receives direct leverage therefrom, while at the same time the lock is provided with all the safeguards of a tumbler lock.

Having now described my invention, what I claim, and desire to secure by Letters Patent, is- I 1. In a door-lock, the combination with a spring mortise-lock, having a rotatable cylinder provided with a slot and an integrallyformed bit adapted to engage With and operate the latch-bolt shank of the mortise-look; of a pin-tumbler lock having a rotatable cylinder with an extension rectangular in crosssection and formed integral with the inner end thereof, said extension being adapted to fit into the slot in said cylinder in the mortise-lock; and a key-slot in said cylinder and extension thereof extending into the cylinder of the mortise-lock,substantially as, described.

2. In a door-lock, the combination with a spring mortise-lock, having a rotatable cylinder; a bit formed integral with said cylin: der adapted to engage the latch-bolt shank of said mortise-lock to operate the same; a slot in said cylinder; a pin-tumbler lock having a rotatable cylinder, formed integral with the inner end of which is an extension rectangular in cross-section, the end of said extension being adapted to fit into the slot in said mortise-lock; a removable cap, adapted to fit over said extension and be secured to said rotatable cylinder; and a key-slot in said cylinder and extension thereof; substantially 

